It seems to me that if the took it a ruled for Texas/ They would pretty much would have had to if they wanted to say the constitution mattered.

There's only one strong reason I can thing of that they don't, self interest. They'd have to deal with being blamed for when upset Democrats riot and burn their cites. Which is a big nod to how they would rule. Trump's supportes never reacted in such a way and would not if they did rule against him. They'd be pissed, angry and resist; but not loot, kill, and burn senselessly.